The dph-lifted-copy package

Using this package can cause the vectorised program to have worse
asymptotic complexity than the original.
Use dph-lifted-vseg instead.
This package provides the following:
nested arrays and the primitive operators that work on them (PA functions);
the lifted array combinators that the vectoriser introduces (PP functions);
the user facing library functions that work on [::] style arrays (P functions).
Deprecated implementation that performs deep copying replicate.